Lines Matching +full:- +full:dio +full:- +full:long +full:- +full:long
5 needed by the application. The format-string based interface to
19 that to add --defsym options when linking. This means the preprocessor
25 * Printf uses within picolibc (which are all integer-only) now share
27 integer-only and float versions
30 work even when using integer-only or float printf functions.
32 Because the linker gets --defsym flags for both vfprintf and vfscanf,
35 picolibc.specs includes the --gc-sections linker flag. This causes
39 However, the defsym approach does not work with link-time
49 the picolibc built-time option, `-Dformat-default`, which defaults to
54 `-Dformat-default=double`). This offers full printf functionality,
57 support for the upcoming %b format specifier via the `io-percent-b`
58 setting and optional support for long double values via the
59 `io-long-double` setting. The picolibc.specs stanza that matches
64 cc -Wl,--defsym=vfprintf=__d_vfprintf -Wl,--defsym=vfscanf=__d_vfscanf
66 If you're using a linker that supports -alias instead of --defsym,
69 cc -Wl,-alias,___d_vfprintf,_vfprintf -Wl,-alias,___d_vfscanf,_vfscanf
72 `-Dformat-default=float`). This provides support for float, but not
73 double or long double conversions. When picolibc.specs finds
74 -DPICOLIBC_FLOAT_PRINTF_SCANF on the command line during linking,
78 cc -Wl,--defsym=vfprintf=__f_vfprintf -Wl,--defsym=vfscanf=__f_vfscanf
80 If you're using a linker that supports -alias instead of --defsym,
83 cc -Wl,-alias,___f_vfprintf,_vfprintf -Wl,-alias,___f_vfscanf,_vfscanf
86 `-Dformat-default=long-long`). This removes support for all float and
88 positional parameters optional via the `io-c99-formats` and
89 `io-pos-args` settings. The picolibc.specs stanza that matches this
94 cc -Wl,--defsym=vfprintf=__l_vfprintf -Wl,--defsym=vfscanf=__l_vfscanf
96 If you're using a linker that supports -alias instead of --defsym,
99 cc -Wl,-alias,___l_vfprintf,_vfprintf -Wl,-alias,___l_vfscanf,_vfscanf
102 `-Dformat-default=integer`). This removes support for long long
103 conversions where those values are larger than long values. The
108 cc -Wl,--defsym=vfprintf=__i_vfprintf -Wl,--defsym=vfscanf=__i_vfscanf
110 If you're using a linker that supports -alias instead of --defsym,
113 cc -Wl,-alias,___i_vfprintf,_vfprintf -Wl,-alias,___i_vfscanf,_vfscanf
116 `-Dformat-default=minimal`). This removes support for width and
122 `io-pos-args` or `io-percent-b`. The picolibc.specs stanza that
127 cc -Wl,--defsym=vfprintf=__m_vfprintf -Wl,--defsym=vfscanf=__m_vfscanf
129 If you're using a linker that supports -alias instead of --defsym,
132 cc -Wl,-alias,___m_vfprintf,_vfprintf -Wl,-alias,___m_vfscanf,_vfscanf
148 …-none-eabi-gcc -Os -march=armv7-m --specs=picolibc.specs --oslib=semihost --crt0=hosted -Wl,--defs…
149 $ arm-none-eabi-size printf.elf
152 …-system-arm -chardev stdio,id=stdio0 -semihosting-config enable=on,chardev=stdio0 -monitor none -s…
155 Switching to float-only reduces the size but lets this still work,
158 …-none-eabi-gcc -DPICOLIBC_FLOAT_PRINTF_SCANF -Os -march=armv7-m --specs=picolibc.specs --oslib=sem…
159 $ arm-none-eabi-size printf-float.elf
161 6792 80 4104 10976 2ae0 printf-float.elf
162 …-system-arm -chardev stdio,id=stdio0 -semihosting-config enable=on,chardev=stdio0 -monitor none -s…
165 Selecting the long-long variant reduces the size further, but now the
168 …-none-eabi-gcc -DPICOLIBC_LONG_LONG_PRINTF_SCANF -Os -march=armv7-m --specs=picolibc.specs --oslib…
169 $ arm-none-eabi-size printf-long-long.elf
171 2216 80 4104 6400 1900 printf-long-long.elf
172 …-system-arm -chardev stdio,id=stdio0 -semihosting-config enable=on,chardev=stdio0 -monitor none -s…
175 Going to integer-only reduces the size even further, but now it
176 doesn't output the long long value correctly:
178 …-none-eabi-gcc -DPICOLIBC_INTEGER_PRINTF_SCANF -Os -march=armv7-m --specs=picolibc.specs --oslib=s…
179 $ arm-none-eabi-size printf-int.elf
181 2056 80 4104 6240 1860 printf-int.elf
182 …-system-arm -chardev stdio,id=stdio0 -semihosting-config enable=on,chardev=stdio0 -monitor none -s…
189 …-none-eabi-gcc -DPICOLIBC_MINIMAL_PRINTF_SCANF -Os -march=armv7-m --specs=picolibc.specs --oslib=s…
190 $ arm-none-eabi-size printf-min.elf
192 1520 80 4104 5704 1648 printf-min.elf
193 …-system-arm -chardev stdio,id=stdio0 -semihosting-config enable=on,chardev=stdio0 -monitor none -s…
196 There's a build-time option available that enables long-long support
197 in the minimal printf variant, `-Dminimal-io-long-long=true`. Building with
198 that increases the size modestly while fixing the long long output:
200 $ arm-none-eabi-size printf-min.elf
202 1632 80 4104 5816 16b8 printf-min.elf
203 …-system-arm -chardev stdio,id=stdio0 -semihosting-config enable=on,chardev=stdio0 -monitor none -s…
208 In addition to the application build-time options, picolibc includes a
209 number of picolibc build-time options to control the feature set (and
212 * `-Dio-c99-formats=true` This option controls whether support for
213 the C99 type-specific format modifiers 'j', 'z' and 't' and the hex
214 float format 'a' are included in the long-long, integer and minimal
218 * `-Dio-pos-args=true` This option add support for C99 positional
219 arguments to the long long and integer printf and scanf variant
224 * `-Dio-long-long=true` This deprecated option controls whether
225 support for long long types is included in the integer variant of
227 select the long long printf and scanf variants. This option is
230 * `-Dminimal-io-long-long=true` This option controls whether support
231 for long long types is included in the minimal variant of printf
234 * `-Dio-float-exact=true` This option, which is enabled by default,
237 (e.g. "%.9g") for 32-bit floats and 17 digits (e.g. "%.17g") for
238 64-bit floats ensures that passing the output back to scanf will
239 exactly re-create the original value.
241 * `-Dio-long-double=true` This option add support for long double
242 parameters. That is limited to systems using 80- and 128- bit long
243 doubles, or systems for which long double is the same as
246 * `-Datomic-ungetc=true` This option, which is enabled by default,
248 make them re-entrant. Without this option, multiple threads using
251 * `-Dprintf-small-ultoa=true` This option, which is enabled by
252 default, switches printf's binary-to-decimal conversion code to a
257 custom divide-and-modulus-by-ten implementations.
265 * `-Dtinystdio=false` This disables the tinystdio code and uses
268 * `-Dnewlib-stdio64=true` This option changes the newlib stdio code
270 64-bit versions of stdio interfaces which are defined with types
271 which may be 32-bits (like 'long'). This option is enabled by default.
277 'nano' printf code doesn't support long-long integer output, so we
278 can't use that, and we need to enable long-long and floating point
281 $ mkdir build-arm; cd build-arm
282 $ ../scripts/do-arm-configure -Dtinystdio=false -Dio-long-long=true -Dnewlib-io-float=true
287 …-none-eabi-gcc -Os -march=armv7-m --specs=picolibc.specs --oslib=semihost --crt0=hosted -Wl,--defs…
288 $ arm-none-eabi-size printf.elf
291 …-system-arm -chardev stdio,id=stdio0 -semihosting-config enable=on,chardev=stdio0 -monitor none -s…