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GCC/Clang: Treat void pointer arithmetic as error

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As an extension, GNU C treats sizeof(void) as 1. MSVC doesn't.
Make it an error on GCC/Clang to avoid accidental MSVC breakage.
This commit is contained in:
Ahmad Fatoum 2018-01-18 13:22:41 +01:00
parent a2edc9d641
commit 30ef3f3122
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GPG key ID: C3EAC3DE9321D59B
2 changed files with 16 additions and 10 deletions
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5
CMakeLists.txt
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@ -11,6 +11,11 @@ if(CMAKE_VERSION VERSION_LESS "3.1")
else() else()
set (CMAKE_C_STANDARD 99) set (CMAKE_C_STANDARD 99)
endif() endif()
include(CheckCCompilerFlag)
CHECK_C_COMPILER_FLAG("-Werror=pointer-arith" COMPILER_HAS_POINTER_ARITH_TOGGLE)
if(COMPILER_HAS_POINTER_ARITH_TOGGLE)
set(CMAKE_C_FLAGS "-Werror=pointer-arith ${CMAKE_C_FLAGS}")
endif()
add_subdirectory(src release) add_subdirectory(src release)

3
src/Makefile
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@ -259,7 +259,8 @@ endif
# -fgnu89-inline declaring inline functions support (GCC optimized) # -fgnu89-inline declaring inline functions support (GCC optimized)
# -Wno-missing-braces ignore invalid warning (GCC bug 53119) # -Wno-missing-braces ignore invalid warning (GCC bug 53119)
# -D_DEFAULT_SOURCE use with -std=c99 on Linux and PLATFORM_WEB, required for timespec # -D_DEFAULT_SOURCE use with -std=c99 on Linux and PLATFORM_WEB, required for timespec
CFLAGS += -O1 -Wall -std=c99 -D_DEFAULT_SOURCE -fgnu89-inline -Wno-missing-braces # -Werror=pointer-arith catch unportable code that does direct arithmetic on void pointers
CFLAGS += -O1 -Wall -std=c99 -D_DEFAULT_SOURCE -fgnu89-inline -Wno-missing-braces -Werror=pointer-arith
# Additional flags for compiler (if desired) # Additional flags for compiler (if desired)
#CFLAGS += -Wextra -Wmissing-prototypes -Wstrict-prototypes #CFLAGS += -Wextra -Wmissing-prototypes -Wstrict-prototypes