Hi, I seem to have run into a problem when compiling zsh 5.1.1 or older builds down to 5.0.7 with the mathfunc module compiled in. This occurs with regular uclibc as well. Here's the build script I'm using. I run this by typing: sh build "$ARCH".

: ${PREFIX:=/opt}
SROOT="$(find $CROSS -maxdepth 1 -type d -name ${1}*)"
make clean
./configure --host=$1 --prefix=$PREFIX \
--enable-function-subdirs \
--enable-multibyte --enable-cap \
--disable-dynamic --disable-restricted-r \
--enable-zsh-secure-free --with-tcsetpgrp \
--disable-locale \
CC=$CROSS/bin/gcc \
CFLAGS="-Os -s -I$PREFIX/include -I$SROOT/sysroot/usr/include" \
LDFLAGS="-static -L$PREFIX/lib -L$SROOT/sysroot/usr/lib -Wl,-z,norelro -Wl,--hash-style=gnu" \
LD=$CROSS/bin/ld \
STRIP=$CROSS/bin/strip \
RANLIB=$CROSS/bin/ranlib

make V=1

This is the error I get:
/home/jan/a/uclibc-ng-arm.thumb.nolocale.newlibs/bin/gcc -c -I. -I../Src -I../Src -I../Src/Zle -I. -Os -s -I/opt/include -I/home/jan/a/uclibc-ng-arm.thumb.nolocale.newlibs/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include -DHAVE_CONFIG_H -Os -s -I/opt/include -I/home/jan/a/uclibc-ng-arm.thumb.nolocale.newlibs/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/include  -o params.o params.c
make[3]: Entering directory '/home/jan/a/zsh-5.1.1/Src/Builtins'
make[3]: Leaving directory '/home/jan/a/zsh-5.1.1/Src/Builtins'
make[3]: Entering directory '/home/jan/a/zsh-5.1.1/Src/Modules'
make[4]: Entering directory '/home/jan/a/zsh-5.1.1/Src/Zle'
make[4]: 'complete.mdh' is up to date.
make[4]: Leaving directory '/home/jan/a/zsh-5.1.1/Src/Zle'
make[3]: Leaving directory '/home/jan/a/zsh-5.1.1/Src/Modules'
make[3]: Entering directory '/home/jan/a/zsh-5.1.1/Src/Zle'
make[3]: Leaving directory '/home/jan/a/zsh-5.1.1/Src/Zle'
make[2]: Leaving directory '/home/jan/a/zsh-5.1.1/Src'
Updated `stamp-modobjs'.
rm -f zsh
/home/jan/a/uclibc-ng-arm.thumb.nolocale.newlibs/bin/gcc -static -L/opt/lib -L/home/jan/a/uclibc-ng-arm.thumb.nolocale.newlibs/arm-buildroot-linux-uclibcgnueabihf/sysroot/usr/lib -Wl,-z,norelro -Wl,--hash-style=gnu   -o zsh main.o  `cat stamp-modobjs`    -lcap -ltinfo -lrt -lm  -lc
Modules/mathfunc.o: In function `math_func':
mathfunc.c:(.text+0x3ba): undefined reference to `j0'
mathfunc.c:(.text+0x3c0): undefined reference to `j1'
mathfunc.c:(.text+0x3ca): undefined reference to `jn'
mathfunc.c:(.text+0x446): undefined reference to `y0'
mathfunc.c:(.text+0x44c): undefined reference to `y1'
mathfunc.c:(.text+0x456): undefined reference to `yn'
collect2: error: ld returned 1 exit status
Makefile:229: recipe for target 'zsh' failed
make[1]: *** [zsh] Error 1
make[1]: Leaving directory '/home/jan/a/zsh-5.1.1/Src'
Makefile:190: recipe for target 'all' failed
make: *** [all] Error 1

I'm not sure what to make of this. I know that uclibc/uclibc-ng has the bessel functions in libm, but the zsh build still gives this error. I was able to compile zsh with the mathfunc module using a musl toolchain, so I think this is specific to uclibc. The uclibc-ng toolchain I'm using is from a buildroot 08/2015 configuration. I'd really appreciate some pointers on this.

Best regards,

Jan