Package: clang-7 Version: 1:7.0.1~+rc2-4 Severity: normal Tags: upstream Given this simple program:
-- >8 -- #include <math.h> int main(void) { double f = 2.0; if (isnan(f)) return 1; return 0; } -- >8 -- we get conversion warnings when using clang, but not gcc. This is particularly annoying when trying to keep a project warning free and using -Werror. $ clang -Wconversion -o foo foo.c foo.c:7:12: warning: implicit conversion loses floating-point precision: 'double' to 'float' [-Wconversion] if (isnan(f)) ~~~~~~^~ /usr/include/math.h:644:46: note: expanded from macro 'isnan' # define isnan(x) __MATH_TG ((x), __isnan, (x)) ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~ /usr/include/math.h:559:16: note: expanded from macro '__MATH_TG' ? FUNC ## f ARGS \ ~~~~~~~~~ ^~~~ 1 warning generated. $ gcc -Wconversion -o foo foo.c -- System Information: Debian Release: buster/sid APT prefers unstable-debug APT policy: (500, 'unstable-debug'), (500, 'unstable') Architecture: amd64 (x86_64) Kernel: Linux 4.18.0-2-amd64 (SMP w/4 CPU cores) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages clang-7 depends on: ii binutils 2.31.1-7 ii libc6 2.27-8 ii libc6-dev 2.27-8 ii libclang-common-7-dev 1:7.0.1~+rc2-4 ii libclang1-7 1:7.0.1~+rc2-4 ii libgcc-8-dev 8.2.0-9 ii libgcc1 1:8.2.0-9 ii libllvm7 1:7.0.1~+rc2-4 ii libobjc-8-dev 8.2.0-9 ii libstdc++-8-dev 8.2.0-9 ii libstdc++6 8.2.0-9 Versions of packages clang-7 recommends: ii libomp-7-dev 1:7.0.1~+rc2-4 ii llvm-7-dev 1:7.0.1~+rc2-4 ii python 2.7.15-3 Versions of packages clang-7 suggests: pn clang-7-doc <none> -- no debconf information