Build.mk changes to allow the use of CPPFLAGS, CFLAGS and CXXFLAGS. #2065
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…d if the following is observed - CPPFLAGS - common flags for C and C++ - CFLAGS - C only flags - CXXFLAGS - C++ only flags In addition some toolchains require special standard for their C or C++ headers. Therefore every architecture should be responsible in the Arch/*/build.mk to set the C standard as a CFLAG.
…FLAGS, CFLAGS and CXXFLAGS.
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mikee47
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May 7, 2020
Sming/Arch/Esp8266/build.mk
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| @@ -4,7 +4,8 @@ | |||
| # | |||
| ############## | |||
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| CFLAGS += -DARCH_ESP8266 | |||
| CPPFLAGS += -DARCH_ESP8266 | |||
| CFLAGS += -std=c11 | |||
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Should C coding standard be set in main build.mk file, rather than repeating for arch. ?
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Should C coding standard be set in main build.mk file, rather than repeating for arch. ?
We could set a default one in the main build.mk file but allow every architecture to change it if needed. For Arch Esp32 we need c99 standard for the c files otherwise too may problems pop-up.
Sming/building.rst
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| .. envvar:: COMPONENT_CFLAGS | ||
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| Used to provide **ONLY** C++ flags that are applied globally. |
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Remove - already listed above (lines 599 - 605).
| @@ -116,7 +116,7 @@ CFLAGS_COMMON = \ | |||
| -ffunction-sections | |||
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CFLAGS_COMMON can probably just be rolled into CPPFLAGS, it's not used anywhere else.
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Before this PR it was impossible to set easily C only flag because CFLAGS was used to set both C and C++ flags.
With this PR the common C/C++ flags should be set using the CPPFLAGS, as in a standard makefile.
With this change CFLAGS will be further on used ONLY for C compilation flags.
This PR is part of the changes needed to allow the compilation of the upcoming ESP32 architecture.
With this PR CPPFLAGS, CFLAGS and CXXFLAGS are allowed only in the Sming/Arch/*/build.mk files and should not be used in a component or application makefile.