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Update cross compile info

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Vladimir Nikolić 2024-07-05 12:32:58 -07:00 committed by GitHub
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README.md
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@ -67,17 +67,17 @@ build options you plan to set.
### Cross compile
Set `CC` and `FC` to point to the cross toolchains, and set `HOSTCC` to your host C compiler.
The target must be specified explicitly when cross compiling.
The target must be specified explicitly when cross compiling. The `CROSS=1` flag should be specified.
Examples:
* On an x86 box, compile this library for a loongson3a CPU:
```sh
make BINARY=64 CC=mips64el-unknown-linux-gnu-gcc FC=mips64el-unknown-linux-gnu-gfortran HOSTCC=gcc TARGET=LOONGSON3A
make BINARY=64 CC=mips64el-unknown-linux-gnu-gcc FC=mips64el-unknown-linux-gnu-gfortran HOSTCC=gcc TARGET=LOONGSON3A CROSS=1
```
or same with the newer mips-crosscompiler put out by Loongson that defaults to the 32bit ABI:
```sh
make HOSTCC=gcc CC='/opt/mips-loongson-gcc7.3-linux-gnu/2019.06-29/bin/mips-linux-gnu-gcc -mabi=64' FC='/opt/mips-loongson-gcc7.3-linux-gnu/2019.06-29/bin/mips-linux-gnu-gfortran -mabi=64' TARGET=LOONGSON3A
make HOSTCC=gcc CC='/opt/mips-loongson-gcc7.3-linux-gnu/2019.06-29/bin/mips-linux-gnu-gcc -mabi=64' FC='/opt/mips-loongson-gcc7.3-linux-gnu/2019.06-29/bin/mips-linux-gnu-gfortran -mabi=64' TARGET=LOONGSON3A CROSS=1
```
* On an x86 box, compile this library for a loongson3a CPU with loongcc (based on Open64) compiler: